Now, to the remarkable story of a minnesota teenage who survived a rare wolf attack on a camping trip. The young man is speaking out about the frightening ordeal. And alex perez has his story. Reporter: This morning, noah graham is counting his blessings after a surprise attack and a cabin trip he'll never forget. The 16-year-old was lying in a sleeping bag outside his tent in rural, minnesota, when he was mauled by this gray wolf. I didn't hear the wolf coming. I didn't see it. No sense that it was there until it was on my head. Reporter: Graham reached back and used his bare hands to pull his head out of the wolf's jaws, leaving a gash and deep scratches. I thought it would come back at me. That's the scary part. Reporter: Authorities track down the wolf they believe attacked graham. It's been put to sleep and is being tested for rabies. The wolf had an unusual jaw, possibly making it hard for the animal to hunt. It kept it from acting as a normal wolf would. Reporter: Wolf attacks on humans are rare. This is the first documented wolf attack ever in the state of minnesota. And in all of north america, there's only been two documented deaths caused by wolf attacks. But even with those slim chances, you won't find graham sleeping outside of his tent the next time he goes camping. I'm sure I'll go camping again. I don't know about sleeping out in the open. Reporter: For "good morning america," alex perez, abc news, chicago.

This transcript has been automatically generated and may not be 100% accurate.

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